SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886b0baede1bd6d94745928dd7066691abe90caf476de882bec1b7200c18e6ce' 
  AND token = '22vVpULgBltYoqAjGDazQKzFFsHBmnJExHwjUfMIBUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}